Malicious PDF — malware analysis report

Static analysis result for SHA-256 005f7986961d09d7…

MALICIOUS

PDF

36.3 KB Created: 2021-07-03 13:11:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4245162e62f3ffc9040e2f074c1f4589 SHA-1: d2de3d67bf697992c96d90d927d6186e8234b15b SHA-256: 005f7986961d09d7d96d865f08f3a056761f8d68221c0a00bb2a057723da98a2
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/406889139/coin-master-hack-download-2021-game-hack PDF link annotation
    • https://delsys.com.tw/image/data/files/real-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-online-hack-generator_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-free-rewards-link_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/tiktok-free-view-mobile_GM835599320.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/pokemon-go-free-evolve-with-trade_GM1094591345.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-32-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/roblox-wizard-pants-free_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/how-can-i-get-free-robux-in-roblox_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/minecraft-gun-mod-download-free_GM479516143.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/giftrobux-com-generator_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/free-roblox-for-playstation-4_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/how-to-get-free-roblox-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/roblox-commands-hack-download_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000033a7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33A7 23536 bytes
SHA-256: 1818da7c0d30a43ad6fc2cfd32b5f9822132285a3ae89f404b82358cfca4d65d
font_01_sfnt_off000068d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68D7 18988 bytes
SHA-256: 24c61ec5dda380d335f70cf248a1dbd8858f35ecf964e4cb835eae0821bc023c

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